> Are you able to connect to the network/internet?

Wojciech> I don't have the tlp0 device (which is the ethernet device)...
Wojciech> It's funny because, the kernel from the boot cd mounted this device, but
Wojciech> the kernel that was installed doesn't.

There are trivial confusion on tlp0/de0 device on install kernel and
generic kernel.
tlp0 is new and de0 (or some other) is a little bit old driver name.
It is just a matter of device name. ( That is not ultimately correct, though)

Do you find any string on boot message (dmesg) for the network device ?
If you find, say de0, just rename 
mv /etc/ifconfig.tlp0 /etc/ifconfig.de0

In some case I would make tlp-enabled-kernel with following change.

--- sys/arch/macppc/conf/GENERIC	Wed May  2 00:50:25 2001
+++ sys/arch/macppc/conf/GENERIC.tlp	Fri Oct 26 09:14:39 2001
@@ -127,7 +127,6 @@
 pchb*	at pci? dev ? function ?	# PCI-Host bridges
 ppb*	at pci? dev ? function ?	# PCI-PCI bridges
 
-de*	at pci? dev ? function ?	# DEC 21x4x-based Ethernet
 fpa*	at pci? dev ? function ?	# DEC PCI FDDI (DEFPA) Controller
 ep*	at pci? dev ? function ?	# 3Com 3c59x
 epic*	at pci? dev ? function ?	# SMC EPIC/100 Ethernet
@@ -135,6 +134,17 @@
 fxp*	at pci? dev ? function ?	# Intel EtherExpress PRO 10+/100B
 ne*	at pci? dev ? function ?	# NE2000-compatible Ethernet
 rtk*	at pci? dev ? function ?	# Realtek 8129/8139
+tlp*	at pci? dev ? function ?	# DECchip 21x4x (and clones) Ethernet
+# --------------------
+# Subject: Re: nfs/rcp copy performance
+# From: 
+# Date: Fri, 28 Sep 2001 12:48:22 +0900 (JST)
+# --------------------
+options 	TLP_MATCH_21040
+options 	TLP_MATCH_21041
+options 	TLP_MATCH_21140
+options 	TLP_MATCH_21142
+#
 sip*	at pci? dev ? function ?	# SiS 900/7016 Ethernet
 adv*	at pci? dev ? function ?	# AdvanSys 1200[A,B], 9xx[U,UA] SCSI
 ahc*	at pci? dev ? function ?	# Adaptec 294x, aic78x0 SCSI



---
Makoto Fujiwara
http://www.ki.nu/software/NetBSD/iBook2/